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EP1176736A3 - Method to automate the preliminary equalization of combined signals in space diversity radio receivers - Google Patents

Method to automate the preliminary equalization of combined signals in space diversity radio receivers Download PDF

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Publication number
EP1176736A3
EP1176736A3 EP01117255A EP01117255A EP1176736A3 EP 1176736 A3 EP1176736 A3 EP 1176736A3 EP 01117255 A EP01117255 A EP 01117255A EP 01117255 A EP01117255 A EP 01117255A EP 1176736 A3 EP1176736 A3 EP 1176736A3
Authority
EP
European Patent Office
Prior art keywords
cycle
signals
sign
check
equalization
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Granted
Application number
EP01117255A
Other languages
German (de)
French (fr)
Other versions
EP1176736A2 (en
EP1176736B1 (en
Inventor
Antonella Dal Lago
Andrea Dell'orto
Sergio Fumagalli
Luigi Sampietro
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Siemens Holding SpA
Original Assignee
Siemens Information and Communication Networks SpA
Siemens Information and Communication Networks Inc
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Siemens Information and Communication Networks SpA, Siemens Information and Communication Networks Inc filed Critical Siemens Information and Communication Networks SpA
Publication of EP1176736A2 publication Critical patent/EP1176736A2/en
Publication of EP1176736A3 publication Critical patent/EP1176736A3/en
Application granted granted Critical
Publication of EP1176736B1 publication Critical patent/EP1176736B1/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

Links

Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B7/00—Radio transmission systems, i.e. using radiation field
    • H04B7/02—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas
    • H04B7/04—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas
    • H04B7/08—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the receiving station
    • H04B7/0837—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the receiving station using pre-detection combining
    • H04B7/0842—Weighted combining
    • H04B7/0845—Weighted combining per branch equalization, e.g. by an FIR-filter or RAKE receiver per antenna branch

Landscapes

  • Engineering & Computer Science (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Signal Processing (AREA)
  • Radio Transmission System (AREA)
  • Cable Transmission Systems, Equalization Of Radio And Reduction Of Echo (AREA)
  • Transceivers (AREA)

Abstract

In the following a method to automate the preliminary equalization of combined signals in space diversity receivers is described. The method includes a start cycle in order to check the absence of irregular propagation of radio signals caused by atmospheric events, or to wait for the end of these events, followed by an equalization step of the centre-band amplitudes of the Main and Diversity signals, and by a cycle aiming at maximizing a target function ΔP that decreases with the absolute value of the delay τ between the signals at the combination point. The second cycle includes a first step to check the absence of flat fading and of selective fading within the band of the modulated signal, followed by a cycle of phase shifting the Diversity signal with small phase variations, at each step the logarithmic value of the maximum and minimum amplitudes of the combined Vcomb signal is stored. After each 360° rotation, the ΔP function is calculated, that is given by the difference between the stored maximum and the minimum Vcomb values. The current ΔP is compared with the ΔP measured at the previous 360° rotation, to check if it has increased or decreased. The ▵τ on the Main signal path is then changed, which absolute value and sign, in the increasing direction of ΔP, depend on the starting delay and on the sign, or on the absolute value and sign, of the difference between the two ΔP. The procedure ends when the current ΔP exceeds a threshold set as target for the accuracy of the preliminary equalization (Figure 1).
EP01117255A 2000-07-28 2001-07-17 Method to automate the preliminary equalization of combined signals in space diversity radio receivers Expired - Lifetime EP1176736B1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
ITMI001746 2000-07-28
IT2000MI001746A IT1318274B1 (en) 2000-07-28 2000-07-28 PROCEDURE TO AUTOMATE THE PRELIMINARY EQUALIZATION OF COMBINED SIGNALS IN RADIO RECEIVERS IN DIFFERENT SPACE.

Publications (3)

Publication Number Publication Date
EP1176736A2 EP1176736A2 (en) 2002-01-30
EP1176736A3 true EP1176736A3 (en) 2002-10-23
EP1176736B1 EP1176736B1 (en) 2005-10-12

Family

ID=11445603

Family Applications (1)

Application Number Title Priority Date Filing Date
EP01117255A Expired - Lifetime EP1176736B1 (en) 2000-07-28 2001-07-17 Method to automate the preliminary equalization of combined signals in space diversity radio receivers

Country Status (4)

Country Link
EP (1) EP1176736B1 (en)
AT (1) ATE306755T1 (en)
DE (1) DE60113931T2 (en)
IT (1) IT1318274B1 (en)

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US7668525B2 (en) * 2007-03-01 2010-02-23 Delphi Technologies, Inc. System and method of a stereo receiving system

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0333042A1 (en) * 1988-03-18 1989-09-20 Alcatel Telspace Receiver for a space diversity radio transmission system
US5581583A (en) * 1992-05-25 1996-12-03 Alcatel Italia S.P.A. Optimizing the analog BER function in a spatial angular diversity digital radio receiver
US5668839A (en) * 1992-10-14 1997-09-16 Siemens Telecommunicazioni S.P.A. IF signal combiner for minimizing the BER in a space or angle diversity digital radio receiver
EP0889540A1 (en) * 1997-07-03 1999-01-07 Lucent Technologies Inc. Delay line antenna array system
US6029056A (en) * 1997-05-19 2000-02-22 Fujitsu Limited Space diversity receiving apparatus

Family Cites Families (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
IT1298810B1 (en) * 1998-03-26 2000-02-02 Italtel Spa METHOD OF COMPENSATION OF THE STATIC DELAY DIFFERENCE BETWEEN SIGNALS FROM TWO ANTENNAS FOR RECEIVERS IN DIFFERENCES OF

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0333042A1 (en) * 1988-03-18 1989-09-20 Alcatel Telspace Receiver for a space diversity radio transmission system
US5581583A (en) * 1992-05-25 1996-12-03 Alcatel Italia S.P.A. Optimizing the analog BER function in a spatial angular diversity digital radio receiver
US5668839A (en) * 1992-10-14 1997-09-16 Siemens Telecommunicazioni S.P.A. IF signal combiner for minimizing the BER in a space or angle diversity digital radio receiver
US6029056A (en) * 1997-05-19 2000-02-22 Fujitsu Limited Space diversity receiving apparatus
EP0889540A1 (en) * 1997-07-03 1999-01-07 Lucent Technologies Inc. Delay line antenna array system

Also Published As

Publication number Publication date
EP1176736A2 (en) 2002-01-30
ITMI20001746A0 (en) 2000-07-28
ATE306755T1 (en) 2005-10-15
EP1176736B1 (en) 2005-10-12
DE60113931T2 (en) 2006-06-22
ITMI20001746A1 (en) 2002-01-28
DE60113931D1 (en) 2005-11-17
IT1318274B1 (en) 2003-07-28

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